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| author | Eric Dumazet <dada1@cosmosbay.com> | 2008-11-20 20:39:09 -0800 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2008-11-20 20:39:09 -0800 |
| commit | 9db66bdcc83749affe61c61eb8ff3cf08f42afec (patch) | |
| tree | 81bb20e4f569d3b44731498428277db9d77fa7a9 /net/ipv6 | |
| parent | b8c26a33c8b6f0a150e9cb38ed80b890be55395c (diff) | |
| download | kernel_samsung_espresso10-9db66bdcc83749affe61c61eb8ff3cf08f42afec.zip kernel_samsung_espresso10-9db66bdcc83749affe61c61eb8ff3cf08f42afec.tar.gz kernel_samsung_espresso10-9db66bdcc83749affe61c61eb8ff3cf08f42afec.tar.bz2 | |
net: convert TCP/DCCP ehash rwlocks to spinlocks
Now TCP & DCCP use RCU lookups, we can convert ehash rwlocks to spinlocks.
/proc/net/tcp and other seq_file 'readers' can safely be converted to 'writers'.
This should speedup writers, since spin_lock()/spin_unlock()
only use one atomic operation instead of two for write_lock()/write_unlock()
Signed-off-by: Eric Dumazet <dada1@cosmosbay.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv6')
| -rw-r--r-- | net/ipv6/inet6_hashtables.c | 15 |
1 files changed, 7 insertions, 8 deletions
diff --git a/net/ipv6/inet6_hashtables.c b/net/ipv6/inet6_hashtables.c index 21544b9..e0fd681 100644 --- a/net/ipv6/inet6_hashtables.c +++ b/net/ipv6/inet6_hashtables.c @@ -38,14 +38,14 @@ void __inet6_hash(struct sock *sk) } else { unsigned int hash; struct hlist_nulls_head *list; - rwlock_t *lock; + spinlock_t *lock; sk->sk_hash = hash = inet6_sk_ehashfn(sk); list = &inet_ehash_bucket(hashinfo, hash)->chain; lock = inet_ehash_lockp(hashinfo, hash); - write_lock(lock); + spin_lock(lock); __sk_nulls_add_node_rcu(sk, list); - write_unlock(lock); + spin_unlock(lock); } sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1); @@ -195,13 +195,12 @@ static int __inet6_check_established(struct inet_timewait_death_row *death_row, const unsigned int hash = inet6_ehashfn(net, daddr, lport, saddr, inet->dport); struct inet_ehash_bucket *head = inet_ehash_bucket(hinfo, hash); - rwlock_t *lock = inet_ehash_lockp(hinfo, hash); + spinlock_t *lock = inet_ehash_lockp(hinfo, hash); struct sock *sk2; const struct hlist_nulls_node *node; struct inet_timewait_sock *tw; - prefetch(head->chain.first); - write_lock(lock); + spin_lock(lock); /* Check TIME-WAIT sockets first. */ sk_nulls_for_each(sk2, node, &head->twchain) { @@ -230,8 +229,8 @@ unique: WARN_ON(!sk_unhashed(sk)); __sk_nulls_add_node_rcu(sk, &head->chain); sk->sk_hash = hash; + spin_unlock(lock); sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1); - write_unlock(lock); if (twp != NULL) { *twp = tw; @@ -246,7 +245,7 @@ unique: return 0; not_unique: - write_unlock(lock); + spin_unlock(lock); return -EADDRNOTAVAIL; } |